If it is Lily rust, which is a possibility, though rare in Britain, then removing the leaves is the recommended treatment. Viruses do not normally cause leaf spotting like this, they affect the leaves and flowers in a different manner. The leaves and flowers are twisted and distorted, not spotted.

I bought some Pink Defender bulbs earlier this year ( lily beetle proof?) and they look just like the picture. The leaves of two pots of Regale have gone brown and shrivelled from the bottom up, we're so bad I gave up and put them in the compost bin any ideas anyone please ?